well, there are four different kinds of cels 
from evangelion: 1) hankens, which you will 
probably *never* see; 2) regular production cels 
which, when i've seen them come up, sometimes 
start high and sometimes start low, but usually 
always end up selling high at ends of auctions; 
3) hand-inked and painted reproduction cels, 
which look like regular production face shots of 
certain characters; and 4) printed reproduction 
cels, which look like crap in person...

here are some links to some of the hand painted 
and inked repros (on top) and the printed repros 
(on bottom):
http://www.nichibeianime.com/cels/eva.html

hope that helps you in your quest,

haruna